<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>animation</title>
    <style>
        html,
        body {
            padding: 0;
            margin: 0;
            overflow: hidden;
            width: 100%;
            height: 100%;
        }

        #canvas {
            z-index: -999;
        }
    </style>
</head>

<body>
    <canvas id="background"></canvas>
</body>
<script src="pointLine.js"></script>

</html>